He is trepanning the skull to relieve pressure.

Trepanning is a surgical procedure that involves drilling a hole in the skull.

The archaeologists discovered several trepannings at the ancient burial site.

Trepanations were performed in ancient civilizations for various medical purposes.

The doctors performed multiple trepanings to relieve the pressure on the patient's brain.

The trepang is a type of marine animal that resembles a cucumber.

Trepangs are a type of sea cucumber found in the waters of Southeast Asia.

The trepanner carefully drilled a hole in the patient's skull.

The trepanners were skilled surgeons who specialized in drilling holes in the skull.

The Trepaniers are a family of talented artists.